The director may prescribe a higher frequency of inspection or surveillance of a person or firm handling or packing avocados for sale, if the director determines either that repeated violations of this chapter have occurred, or has probable cause to believe that a violation is about to occur or has occurred. The director may charge the person or firm the costs of performing the higher frequency of inspection or surveillance necessary to prevent violations of either this chapter or regulations of the director. Costs shall be based upon the approximate cost of the service which is rendered. This charge shall be in addition to the fee provided for in subdivision (a) of Section 44975 and shall be paid in accordance with subdivision (a) of Section 44975. Any person assessed a cost under this subdivision shall have the right of appeal to the director.